(1/1-tanθ)+(1/1+tanθ)怎么算啊?要过程,谢谢!

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(1/1-tanθ)+(1/1+tanθ)怎么算啊?要过程,谢谢!(1/1-tanθ)+(1/1+tanθ)怎么算啊?要过程,谢谢!(1/1-tanθ)+(1/1+tanθ)怎么算啊?要过程,谢谢!(

(1/1-tanθ)+(1/1+tanθ)怎么算啊?要过程,谢谢!
(1/1-tanθ)+(1/1+tanθ)怎么算啊?要过程,谢谢!

(1/1-tanθ)+(1/1+tanθ)怎么算啊?要过程,谢谢!
(1/1-tanθ)+(1/1+tanθ)
=[(1+tanθ)+(1-tanθ)]/[(1-tanθ)(1+tanθ)]
=2/(1-tan^2 θ)

(1/1-tanθ)+(1/1+tanθ)
=cosθ/(cosθ-sinθ)+cosθ/(cosθ+sinθ)
=2cosθ^2/(cosθ^2-sinθ^2)
=(cos2θ+1)/cos2θ
=1+1/cos2θ